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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
Three Methods:Deltoid ExtensionPush-upsPike PressCommunity Q&A. The deltoid muscles, or deltoideus muscles, are the rounded muscles over the top and sides of the shoulders. There are 3 different sets of muscle fibers that comprise the deltoids: the anterior, lateral and posterior. This muscle allows the shoulder to flex and helps support the rotator cuff. Many weight-lifters do exercises to strengthen and grow their deltoid muscles.